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Superlattices of the repeated structure La(1.56)Sr(0.44)CuO(4)/La(2)CuO(4)(LSCO-LCO), where none of the constituents is superconducting, show asuperconducting transition of T_c \simeq 25 K. In order to elucidate the natureof the superconducting state we have performed a low-energy muSR study. Byapplying a magnetic field parallel (Meissner state) and perpendicular (vortexstate) to the film planes, we could show that superconductivity is sheet like,resulting in a very anisotropic superconducting state. This result isconsistent with a simple charge-transfer model, which takes into account thelayered structure and the difference in the chemical potential between LCO andLSCO, as well as Sr interdiffusion. Using a pancake-vortex model we couldestimate a strict upper limit of the London penetration depth to 380 nm inthese superlattices. The temperature dependence of the muon depolarization ratein field cooling experiments is very similar to what is observed inintercalated BSCCO and suggests that vortex-vortex interaction is dominated byelectromagnetic coupling but negligible Josephson interaction.

Superconductivity in La(1.56)Sr(0.44)CuO(4)/La(2)CuO(4) superlattices